MNI vs Looping functions

RE: MNI vs Looping functions

Chris — Wed, 23 Jun 2021 16:29:35 GMT

I have also noticed (seen up to 20.3) that even with the "Delete previously completed/cancelled instances" checked, in a loop fashion, Appian will pause your process if any node attempts to execute 100,000 times.

Of course we've only seen this in an incorrectly configured process where a loop was used to wait for a kill flag that never became set. Doubt we would ever need to process over 100k nodes otherwise :)

Problem: A process model node has exceeded the node traversal limit.

Details: The number of nodes per process for "MNI" would exceed the limit of 100000.

RE: MNI vs Looping functions

Stewart Burchell — Wed, 23 Jun 2021 07:45:19 GMT

This is not strictly true. If you're using the 'Run one instance for each item in' option and referencing an array that contains 1000 or more items then Appian won't even start the MNI node, even if you've checked the ' Delete previously completed/cancelled instances' option. This is a change to the previous behaviour that using the option you reference would have circumnavigated the 1000 node instance limit. Here's the message the System Admins receive by email:

RE: MNI vs Looping functions

Stefan Helzle — Wed, 23 Jun 2021 06:02:15 GMT

When I need to use MNI or looping in a process I make sure to check this box on the tab "Others". This saves memory and gets around the limit of 1000 node instances.

When this node is completed: delete previously completed/canceled instances

docs.appian.com/.../Process_Node_and_Smart_Service_Properties.html

RE: MNI vs Looping functions

Ayushi Mittal — Wed, 23 Jun 2021 03:33:30 GMT

Just to add we have limit while using MNI we can only execute particular node 1000 times only, while there is no limit for looping function.

RE: MNI vs Looping functions

arpit0001 — Mon, 21 Jun 2021 04:56:36 GMT

Thanks Stefan.

RE: MNI vs Looping functions

Stefan Helzle — Sun, 20 Jun 2021 18:34:05 GMT

Hm ... key difference is that looping functions are just functions with a low execution overhead and memory footprint. MNI means to execute a node in a process multiple time which means that this node must go through the whole process execution mechanism. And this takes way more precious bytes and cpu cycles ;-)

RE: MNI vs Looping functions

arpit0001 — Sun, 20 Jun 2021 18:10:46 GMT

Hi Stefan, Thanks for the answer but can you explain little bit more technically about it? because I am still in a learning phase in Appian and also if someone ask me this question in interview then how should I answer it?

RE: MNI vs Looping functions

Stefan Helzle — Sun, 20 Jun 2021 18:00:54 GMT

System load is way lower and execution time much higher. Is this a general or a specific question?